Interlock; Second Level Maintenance Operations; Preliminary Operations; General Checks And Cleaning - ABB Emax E1 Installation And Service Instructions Manual

8.3.10. Interlock

- Check that the interlock devices have been correctly installed and operate correctly between adjacent and superimposed
switches (if present). The operating test cannot be run in the Test or Extracted positions.

8.4. Second level maintenance operations

8.4.1.

Preliminary operations:

- open the switch and check that the control springs are unloaded
- in the case of a circuit breaker, remove the circuit breaker
from the fi xed part before working on it
WARNING: before working on fi xed switches or
switches on fi xed parts, disconnect the supply to
the power circuit and to the auxiliary circuits and
earth the terminals in a visible manner both on the
supply and on the load side.
8.4.2.

General checks and cleaning:

- Check the cleanliness of the apparatus (switch part), removing
dust and any traces of excess oil or grease with dry cloths (if
necessary, use non-corrosive detergent)
- For excessive deposits, a laminated dilutant such as Henkel
273471 or the equivalent can be used.
- Check that the rating plates of the apparatus are in place
- Clean the rating plates with dry and clean cloths
- Eliminate any dust, mould, traces of condensation or oxida-
tion also inside the fi xed part of the apparatus if the switch
is extractable
- Check that there are no factors such as overheating or cracks
that may compromise switch insulation
- Check the circuit-breaking couple for damage (for the extract-
able switch, see feature A, fi g 39).
- The couple must be silver in colour without trace of erosion
or smoke
- Check that there are no foreign bodies in the switch cabinet
- Check that the fi xing screws are tightened on the fi xed side
to the control panel (M8 - 25Nm).
8.4.3.

Connections between the switch and the control panel

- Use brushes and try cloths to remove dust or dirt on the
insulating parts (if necessary, use non-corrosive detergent -
For excessive deposits, a laminated dilutant such as Henkel
273471 or the equivalent can be used).
- Check that there are no traces of overheating on the termi-
nals. The problem is detected by discoloration of the parts
in contact; the contact points are normally silver in colour.
- Check the tightness of the bolts fi xing the connections to the
terminals (M12 - 70Nm).
WARNING:
Before working on fi xed switches or switches on
fi xed parts, disconnect the supply to the power
circuit and to the auxiliary circuits and earth the
terminals in a visible manner both on the supply
and on the load side.
- Check that the connecting screws of the cables of the terminal
boards are tight (0.7 Nm).
Fig. 40
Model L6555
Fig. 38
Fig. 39
Apparatus
Doc. No
1SDH000460R0002
Scale
Emax
Page No
23/74